Depends from SHTF scenario, but I think it is make sense to be very good prepared with medical knowledge an resources for SHTF.
There s always gonna be people with more medical knowledge then you when SHTF, but it is gonna be valuable knowledge, so you gonna have to pay for it.
Learn today as more as you can.
By the way during the SHTF my relative treated sinus problems with Chamomile inhalation, to have right plants around your home make sense.
Being sick in SHTF time is bad thing, ad it is one more reason why it make sense to have good group of people around you, to help you when you are crippled, unable to get food, trade or defend.